New Climate control unit, Fan not working

N reg A4 2.6 manual
The old climate control unit would only blow hot air on the windscreen, and nothing else.
so I have a new(second hand unit) Ive just installed it and the fans are not blowing. Can any one shed any light on this?
Many thanks

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Update!
Installed new Climate Control unit at work in lunch break, It didn't work.
Drove home later and all working fine ! Wooo hoooo! no more sauna !!
£16 from Ebay not 300 from Audi !
What did we do before ebay???

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